gmane.lisp.cl-opengl.devel

Sample code for vertex arrays

2013-04-27T22:32:54

Can anyone provide sample code using vertex arrays?

The program varray.lisp in the redbook examples uses these but things like gl:vertex-pointer do not appear to be exported into the cl-opengl package.

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slow interpolation issues

cage — 2013-03-10T13:35:04

Hello,

I have written an MD2 3d mesh loader, everything works fine except for
the animations.

Because  the model  save only  the key  frame for  each  animation the
loader  must interpolate  the vertex  position of  the mesh  to  get a
smooth animation.

My solution was to save the  triangles vertices in a gl-array for each
frame an then doing linear interpolation, something like that:


(defun lerp-gl-array (a b c count interpolation-factor)
  (dotimes (i count) 
    (setf (gl:glaref c i) 
      (alexandria:lerp interpolation-factor (gl:glaref a i) (gl:glaref b i)))))

but it seem to be too slow as shown by the SBCL profiler


  seconds  |     gc     |     consed    | calls |  sec/call  |  name  
-----------------------------------------------------------
   264.554 |      8.189 | 8,307,049,792 | 2,870 |   0.092179 | CL-GL-UTILS:LERP-GL-ARRAY
-----------------------------------------------------------
   264.554 |      8.189 | 8,307,049,792 | 2,870 |            | Total

is this my fault? Any idea how can I improve performance?

Thank you.
C.

glop

Luís Oliveira — 2013-01-28T21:15:28

Hello,

This project is potentially interesting for cl-opengl users:
<https://github.com/patzy/glop>. Has anybody tried it out?

Cheers,

package "GL" not found

Nick Khamis — 2012-12-27T00:58:33

Hello Everyone,

My current environment consists of (Emacs, SBCL, ASDF, and SLIME).
Trying to run a few minimalistic examples I keep getting:

package "GL" not found

Things I have done to try to make ASDF central registry aware of the
cl-opengl implementation:

#~/.sbclrc

;;; asdf-prep.lisp
(dolist (subdir (list ;; ... some other packages ...
                      #P"cl-opengl/"))
  (push (merge-pathnames subdir #P"/usr/local/tools/")
        asdf:*central-registry*))

And in the code I added:

(require :asdf)                 ; need ASDF to load other things
(asdf:load-system :cl-opengl)   ; load OpenGL bindings
(asdf:load-system :cl-glu)      ; load GLU bindings
(asdf:load-system :cl-glut)     ; load GLUT bindings


I have heard of quicklisp however, trying to understand how
environment variables work, and would like to get it going with
this minimalistic setup first if possible.


Your help is greatly appreciated,

Nick.

cl-glut not able to open windows until shown howby lispbuilder-sdl

Zach Hall — 2012-08-07T13:02:06

Hi everyone,

I'm having a weird problem with cl-glut.

When I run something using glut to produce a window, I don't get a window.
Inserting a swank-handler into the loop of the examples, I determined that
they WERE running, they just weren't giving me a window.

I'm using Windows 7, Clozure-CL and I have FreeGlut loaded and detected
properly. Everything works, except that the window doesn't show.

So! I decided to try Lispbuilder-SDL, I loaded up their examples and they
are able to successfully open windows.

What's really odd about this, is that AFTER I've created a window using
Lispbuilder, it seems to show Glut what to do, and Glut can suddenly open
display windows properly.

Does anyone have any idea what could be causing this?
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How to install/run the demo code?

John Crawford — 2012-08-03T13:42:32

How do I install and run the demo code? I'm running Lispworks PE 6.01 
on Windows, I've installed quicklisp and ran: (ql:quickload 
"cl-opengl") which seemed to download the library. But so far I 
haven't managed to run the demo examples. Thanks.

John C>

Documentation status?

John Crawford — 2012-08-02T20:54:24

Looking back through the archives, I see a post in 2010 about the 
documentation not yet having created. Is that still the case? If it 
*does* exist (or can be created), how/where would it be? Thanks.

John C>

gl-array count

Chris Bagley — 2012-07-19T12:39:36

I've been slowly getting my head round the gl-array macros and there is one
last thing that is confusing me
In this struct, size is set to the type of unsigned byte...why? It seem
that this stores the length of the foreign array which, as far as I can
tell from CFFI doco, is an integer.

(defstruct (gl-array (:copier nil))

  "Pointer to C array with size and type information attached."

  (pointer (null-pointer))

  (size 0 :type unsigned-byte)

  (type nil :type symbol))

There's probably something I'm missing and if anyone can explain that
would be great!
Thanks folks
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Thanks to all

Chris Bagley — 2012-07-16T09:58:05

In open source software it can often seem that not many people are using
what you are creating. So as one of the silent lurkers around these parts I
just want to say thank-you.
I have only recently got into common lisp and cl-opengl has given me a
chance to have something FUN to put my efforts into. It can be hard to get
enthused about some of the more esoteric sides of lisp, but when it goes
into upping frame rates or making virtual explosions suddenly the reason
for studying it seems obvious!

So aye, thanks for all your work, hopefully I'll have something playable
soonish.
Cheers
Baggers
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Соберем gля Вас по сети интeрнет базу gанных

2012-06-21T09:12:27

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Тeл:+79IЗ79З6ЧЗЗ
Skype:s.3837
ICQ:6288862

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Texture coordinates using vertex array

Deepak Surti — 2012-03-30T08:51:52

Hi,

I have written a small library using cl-opengl to do skeletal animation
which works great.
I use vertex arrays in the process. As outlined in opengl-array.lisp under
examples, I have
a gl array of vertices.

To the vertex object in the gl array I added texture coordinates:
(gl:tex-coord :type float :components (u v))

In my code, (just like enable vertex and color array); I enable tex coord
array

; all texture loading code and creating gl vertices/indices code

(gl:enable-client-state :texture-coord-array)
.......
            (gl:bind-gl-vertex-array gl-vertices)
            (gl:draw-elements :triangles gl-indices)
........
(gl:enable-client-state :texture-coord-array)

However it leads to a memory segment address error.

If I go the primitive route, rendering the  triangle vertices and texture
coordinates,
things work fine.

Obviously, as for texture coordinates with draw elements; I am missing
something. I tried
looking up into the source/examples but could not find. [PS: i am no C
expert, so am stuck here]

Any help appreciated,

Let me know in case of any questions,
Thanks and Regards,
Deepak

Extension functions re-defining themselves

Jocelyn Fréchot — 2012-03-16T21:39:59

Hello,

I’d like to report the folling issue I bumped into: in
the cl-opengl-bindings package, extension functions defined with
defglextfun will re-define themselves the first time they are called.
This is somewhat an unexpected and potentially undesirable behavior:
if you store one of those function objects before calling it, it will
compile a new object every time it is funcalled.

Thanks

save 3d scene as .obj file

ronni montoya — 2011-11-28T03:13:44

Hi, Is there is a way of saving a 3d scene into a .obj file in common lisp?

Is there any library for this, i was looking for info and i just found
a library called ply that allow only to read .obj file but not save


any idea?

thanks

R,

mouse-driven camera

ronni montoya — 2011-09-24T11:03:11

Hello im new in this list, im learning opengl with common lisp,  i was
wondering if there is a library or example that allow to control the
perspective of the camera with tthe mouse?

Is there is an easy way of doing this?


thanks


Ronny

CL-OpenGL ES?

Simon Ortiz — 2011-06-25T09:55:09

dear cl-opengl people,

I'm working on a project to make games on Android and iPhone using
Lisp. Thanks to the work of R. Krishnan and S. Ageneau ECL runs on
these devices.

I'm taking it from there and I'm trying to draw to the screen from
Lisp. So far, I've achieved modest results using my own (very small
and rudimentary) OpenGL ES 1.1 interface, which uses ECL's low-level
FFI facility.

But I think that it would be a waste to come up with another OpenGL
interface. I'm thinking, why not better use cl-opengl?

So, I would like to ask you some questions:

- what versions of OpenGL does cl-opengl support?

- say I want to contribute to the project and adapt cl-opengl into
cl-opengl-es11 (and in the far future cl-opengl-es20), how should I do
it? From where can I take it? Is there a similar project I can join?
Is anyone interested in joining efforts?

Thank you very much in advance for your advice.

Sincerely,

--
Simón Ortiz B., M.Sc., Ing. en Computación
Linux Registered User #388735

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a substantial Windows app

Brandon Van Every — 2011-04-07T16:53:02

Hi, I'm pretty new to Common Lisp, Clozure CL, Quicklisp, and
cl-opengl.  I'm looking for a substantial open source app that uses
cl-opengl and builds on Windows.  By "substantial" I mean more than a
very basic game or tutorial or demo.  Something that really puts
cl-opengl to work, preferably with relatively modern OpenGL API
functionality, such as vertex arrays and shaders and not glBegin glEnd
semantics.  Like, a First Person Shooter would be substantial, or a
medical visualization would be substantial.  The purpose is to
understand how the substantial app is built, how robust or buggy the
app is on this platform, and to evaluate the OpenGL performance of the
app.

Is there some easy way in Quicklisp to find all the packages that use
cl-opengl?  (ql:system-apropos "cl-opengl") only lists cl-opengl
itself.  I've been Googling about cl-opengl but that method is proving
to be slow.

"Builds on Windows" is important because sometimes packages want
things that don't readily exist on Windows.  For instance,
until-it-dies makes use of FTGL, an obsolete library that hasn't been
worked on since 2008.  It doesn't have any Windows binaries for the
foreign .dlls.  Although I could go through the pain of modernizing an
old VC8 .sln file, and renaming dependencies to FreeType per some
other website I read, it's just not worth it to me.  I want to look at
a substantial app under active development that actually works on
Windows.

Generally I can handle foreign .dll dependencies as long as those
foreign .dlls are under active development.  I've been shoving various
"SDKs" into C:\Program Files\ and adding their .dll directories to my
PATH.  It keeps Quicklisp happy.  No idea yet if the end products will
actually work, as .dll Hell could rear its ugly head.


Cheers,
Brandon Van Every

Bug in MAKE-NULL-GL-ARRAY

Mason Smith — 2011-02-16T08:39:26

The current make-null-gl-array fails to run as currently defined. When
called with (gl:make-null-gl-array :unsigned-short), SBCL gives the
following error:

0 fell through CTYPECASE expression.
Wanted one of (SYMBOL FUNCTION).
   [Condition of type SB-KERNEL:CASE-FAILURE]

The problem seems simply to be that the arguments when calling
MAKE-GL-ARRAY-FROM-POINTER are reversed.

Specifically, instead of

(make-gl-array-from-pointer (null-pointer) 0 type)

the body of MAKE-NULL-GL-ARRAY should be

(make-gl-array-from-pointer (null-pointer) type 0)


Mason
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Invoking cl-opengl under ubuntu

Greg Bennett — 2011-01-29T17:23:16

Good afternoon from Greg Bennett
I an venturing into graphics in cl undet linix.
Specifically I am running ccl 64-bit under Ubuntu 10.04 using emacs+slime as
an interface; but my lisp experience is from Allegro under Windows. Perhaps
it is not surprising that I am (slightly) baffled by some of the set-up 
activities.

I  downloaded cl-opengl and read the .asd files for it, and for glu, 
glut, glut-examples too.
I saw that all depended on cffi, so I used Ubuntu's apt-get install to 
do just that - fetch and
install cffi - which went smoothly. It took me a while to find out where 
it was located (!)
so I could fix up asdf:*central-registry* with a path to cffi.asd

[Off-topic: is there an easy way to find where packages are installed ? 
The poking about
I have done has yielded noting useful. Should I have 'known' cl-cffi 
would wind up in
/usr/share/common-lisp/systems ?]

Having twiddled the registry, I used (asdf:operate 'asdf:load-op 'cffi) 
which started cheerfully
but then stopped with an simple-file error. For all the .lisp files in, 
for example,
  /usr/share/common-lisp/systems/source/alexandria
are owned by root. It was in trying to process alexandria.lisp that 
things halted.

I am the sole user of the linux box, but it seems that I need a way to 
tell ccl that it should run
as root.

If I am to build cl-opengl I have to get past this block, so I hope that 
someone can provide a magic
incantation or two.

Thanks for all assistance and advice
Cheers /Greg Bennett
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thanks from a happy developer!

Brian Taylor — 2010-11-01T16:13:15

Greetings all!

I just wanted to say thank you for all your work making cl-opengl such a
fantastic bridge between cl and opengl. I'm constantly delighted to see how
lispy it feels to use this library and how easy it is to be productive while
referring to opengl documentation geared towards other languages. This is a
really nice library to work with.

-wubo
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